Determine whether a linear function or a quadratic function would be a more appropriate model for each set of graphed data. If linear, tell whether the slope should be positive or negative. If quadratic, tell whether the coefficient of x² should be positive or negative.

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Average Daily Volume of First-Class Mail Pieces (in millions) 100 90 80 70 60 0 1 1 2 1 1 3 Years Data from USPS. 4 5